18-letter words containing a, r, c, h
- acadian flycatcher — a small, greenish tyrant flycatcher (Empidonax virescens) found in deciduous forests of E North America
- according to hoyle — according to the rules and regulations; in the prescribed, fair, or correct way
- acorn risc machine — (processor) The original name of the Advanced RISC Machine.
- acquired behaviour — the behaviour of an organism resulting from the effects of the environment
- acquired character — a modification of structure or function caused by environmental factors: now generally regarded as not inheritable
- activated charcoal — a form of carbon having very fine pores: used chiefly for adsorbing gases or solutes, as in various filter systems for purification, deodorization, and decolorization.
- actual bodily harm — Actual bodily harm is a criminal offence in which someone gives another person a minor injury.
- addressing machine — a printer that prints addresses directly on to letters, labels, and envelopes
- admirable crichton — a comedy (1902) by Sir James M. Barrie.
- aeronautical chart — a topographic map of an area of the earth's surface, designed as an aid to aircraft navigation
- aerothermodynamics — the study of the exchange of heat between solids and gases, esp of the heating effect on aircraft flying through the air at very high speeds
- african lion hound — one of a South African breed of medium-sized muscular hunting dogs having a short, glossy, red or tan coat, with a characteristic ridge of hair along the spine consisting of parallel crowns of hair growing in the opposite direction of the rest of the coat, originally developed for hunting lions but now used primarily as a guard dog.
- ahead of the curve — People, products or ideas that are ahead of the curve are more advanced or modern than others of their kind.
- albrecht waldstein — Albrecht von [German ahl-brekht fuh n] /German ˈɑl brɛxt fən/ (Show IPA), Wallenstein, Albrecht Wenzel Eusebius von.
- all over the place — If something is happening all over the place, it is happening in many different places.
- alpha-hydroxy acid — a type of organic acid, commonly used in skin-care preparations, that has a hydroxyl group attached to the carbon atom next to the carbon atom carrying the carboxyl group
- alphaphotographics — A display made up of text characters combined with high-resolution photographic images (proposed as a future form of videotex).
- alternative school — any public or private school having a special curriculum, especially an elementary or secondary school offering a more flexible program of study than a traditional school.
- amdahl corporation — (company) A US computer manufacturer. Amdahl is a major supplier of large mainframes, UNIX and Open Systems software and servers, data storage subsystems, data communications products, applications development software, and a variety of educational and consulting services. Amdahl products are sold in more than 30 countries for use in both open systems and IBM plug-compatible mainframe computing environments. Quarterly sales $397M, profits $13M (Aug 1994). In 1997 Amdahl became a division of Fujitsu.
- american chameleon — anole: lizards of this type (family Iguanidae) are incorrectly called “chameleons”
- american cockroach — a large, reddish-brown cockroach, Periplaneta americana, found originally in the southern U.S. but now widely distributed.
- an overgrown child — an adult whose behaviour is characteristic of a child
- angiocardiographic — Relating to angiocardiography.
- anthropocentricity — the state or quality of being anthropocentric.
- anticholinesterase — any of a group of substances that inhibit the action of cholinesterase
- apocryphal gospels — accounts of Christ's life that are not recognized as part of the New Testament
- appalachian spring — a dance (1944) choreographed by Martha Graham, with musical score by Aaron Copland.
- arachibutyrophobia — Fear of peanut butter sticking to the roof of one's mouth.
- arctic archipelago — group of mostly large islands in the Arctic Ocean off the N coast of Canada
- arkansas toothpick — a bowie knife or similar sharp knifelike implement.
- arm's-length price — a price of a transaction agreed in accordance with market values, disregarding any connection such as common ownership of the companies involved
- artificial horizon — an aircraft instrument, using a gyroscope, that indicates the aircraft's attitude in relation to the horizontal
- aspherical surface — a lens or mirror surface that does not form part of a sphere and is used to reduce aberrations
- ast research, inc. — (company) A company, formed some time before 1980, that was a leading personal computer manufacturer. AST developed desktop computers, mobile computers, and servers that were sold in more than 100 countries worldwide. In January 1999 the name and intellectual property were acquired by a new company named AST Computers, LLC. As of 2000-03-02 it was trading as ARI Service.
- astrological chart — map of constellations at certain time
- asynchronous logic — (architecture) A data-driven circuit design technique where, instead of the components sharing a common clock and exchanging data on clock edges, data is passed on as soon as it is available. This removes the need to distribute a common clock signal throughout the circuit with acceptable clock skew. It also helps to reduce power dissipation in CMOS circuits because gates only switch when they are doing useful work rather than on every clock edge. There are many kinds of asynchronous logic. Data signals may use either "dual rail encoding" or "data bundling". Each dual rail encoded Boolean is implemented as two wires. This allows the value and the timing information to be communicated for each data bit. Bundled data has one wire for each data bit and another for timing. Level sensitive circuits typically represent a logic one by a high voltage and a logic zero by a low voltage whereas transition signalling uses a change in the signal level to convey information. A speed independent design is tolerant to variations in gate speeds but not to propagation delays in wires; a delay insensitive circuit is tolerant to variations in wire delays as well. The purest form of circuit is delay-insensitive and uses dual-rail encoding with transition signalling. A transition on one wire indicates the arrival of a zero, a transition on the other the arrival of a one. The levels on the wires are of no significance. Such an approach enables the design of fully delay-insensitive circuits and automatic layout as the delays introduced by the layout compiler can't affect the functionality (only the performance). Level sensitive designs can use simpler, stateless logic gates but require a "return to zero" phase in each transition.
- athletic supporter — jockstrap
- atmospheric engine — an early form of single-acting engine in which the power stroke is provided by atmospheric pressure acting upon a piston in an exhausted cylinder.
- atmospheric window — wavelengths of the electromagnetic spectrum that can be transmitted through the earth's atmosphere. Atmospheric windows occur in the visible, infrared, and radio regions of the spectrum
- auditory phonetics — the branch of phonetics concerned with the perception of speech sounds by humans
- australopithecines — Plural form of australopithecine.
- authorized capital — the total amount of value of the shares that a company is allowed to distribute
- autobiographically — In a autobiographical manner.
- bach flower remedy — an alternative medicine consisting of a distillation from various flowers, designed to counteract negative states of mind and restore emotional balance
- bachelor apartment — a flat consisting of one room that is used as a sitting room and bedroom, as well as a kitchenette and a bathroom
- bachelor's-buttons — any of various plants of the daisy family with button-like flower heads
- bachelorette party — A bachelorette party is a party for a woman who is getting married very soon, to which only women are invited.
- back/down to earth — If you come down to earth or back to earth, you have to face the reality of everyday life after a period of great excitement.
- basket-handle arch — an arch having a symmetrical form drawn from an odd number of radii in excess of one, which increase in length from the springing toward the center.
- behavioral science — any of several studies, as sociology, psychology, anthropology, etc., that examine human activities in an attempt to discover recurrent patterns and to formulate rules about social behavior
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